Preparation and Mechanism of Flame-Retardant Cotton Fabric with Phosphoramidate Siloxane Polymer through Multistep Coating.

Denghui Xu,Zhiming Jiang,Chaohong Dong,Ping Zhu,Yun Liu,Shijie Wang,Yimin Wang

doi:10.3390/polym12071538

Denghui Xu, Zhiming Jiang + Show 5 more

Open Access

https://doi.org/10.3390/polym12071538

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Journal: Polymers	Publication Date: Jul 12, 2020
Citations: 20	License type: CC BY 4.0

Affiliation: Qingdao University

Abstract

To improve the water solubility of phosphoramidate siloxane and decrease the amount of flame-retardant additives used in the functional coating for cotton fabrics, a water-soluble phosphoramidate siloxane polymer (PDTSP) was synthesized by sol-gel technology and flame-retardant cotton fabrics were prepared with a multistep coating process. A vertical flammability test, limited oxygen index (LOI), thermogravimetric analysis, and cone calorimetry were performed to investigate the thermal behavior and flame retardancy of PDTSP-coated fabrics. The coated cotton fabrics and their char residues after combustion were studied by attenuated total reflection infrared spectroscopy (FTIR-ATR), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). All results presented that PDTSP-coated cotton fabrics had good flame retardancy and char-forming properties. PDTSP coating was demonstrated to posess gas-phase flame-retardant mechanism as well as a condensed phase flame-retardant mechanism, which can be confirmed by thermogravimetric analysis-Fourier transform infrared spectroscopy (TG-IR) and cone calorimetry test. Also, the preparation process had little effect on the tensile strength of cotton fabrics, although the air permeability and whiteness had a slight decrease. After different washing cycles, the coated samples still maintained good char-forming properties.

Highlights

Nowadays, functional materials, especially flame-retardant textiles, have attracted much attention along with an increase of public awareness of safety [1]
One and two layers of phosphoramidate siloxane polymer coating were deposited on the fabrics, which were coded as Cotton-PDTSP-1T and Cotton-PDTSP-2T
The siloxane bond (Si–OCH2 CH3 ) in DTSP was firstly hydrolyzed to silanol bond (Si–OH), and copolymerized themselves to form siloxane polymer, which can be reacted with the hydroxyl group (–OH) and bound onto cellulose

Summary

Introduction

Functional materials, especially flame-retardant textiles, have attracted much attention along with an increase of public awareness of safety [1]. Numerous researchers have focused on the investigation of flame-retardant textiles and various preparation methods have been reported [3] Among these methods, sol-gel technique has been recognized as an excellent scientific approach to rendering textiles with different functional properties [4,5,6], such as flame retardancy [7,8], antibacterial properties [9,10], anti-wrinkle [11,12], and superhydrophobicity [13]. Siloxane bonds are firstly hydrolyzed to silanol groups and connected to cellulose substrate to form hydrogen and covalent linkages [14]

Methods

Results

Conclusion